Lamborghini Diablo - FreeFlow Exhaustfits the following models: 1990 1998 Diablo, 1993 1998 Diablo VT, 1995 1999 Diablo SV, 1997 2000 Diablo VT Roadster Does not fit: 1993 1995 Diablo SE30, 1999 2000 Diablo GT, 2000 2001 Diablo VT Roadster The stock exhaust pipes are small and restrict the free flow of exhaust gases from the engine and through the exhaust system. This limits the amount of fuel and air sucked into the engine and results in lower power output than the potential maximum.